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How many ants are crawling on Earth? Researchers estimate

Researchers have made the most thorough assessment to date of the global population of ants - insects that have colonized almost everywhere on the planet - and the estimated total is a mind-blowing 20 quadrillion of them, or approximately 2.5 million for every human.

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"Ants certainly play a very central role in almost every terrestrial ecosystem," said entomologist Patrick Schultheiss of the University of Würzburg in Germany and the University of Hong Kong, co-lead author of the study published this week in the journal Proceedings of the National Academy of Sciences. "They are very important for nutrient cycling, decomposition processes, plant seed dispersal and the perturbation of soil. Ants are also an extremely diverse group of insects, with the different species fulfilling a wide range of functions. But most of all, it is their high abundance that makes them key ecological players," Schultheiss said.